MANCANEGARA
- Octavio Paz Lozano
- Oguchi Onyewu
- Oksana Baiul
- Olaudah Equiano
- Ole Einar Bjørndalen
- Oleg Konstantinovich Antonov
- Oleksandr Kucher
- Olga Korbut
- Oliver Cromwell
- Oliver Fisher Winchester
- Oliver Hart
- Oliver North
- Oliver Otis Howard
- Oliver Stone
- Oliver Tambo
- Oliver Wolf Sacks
- Ollanta Moses Humala
- Olympus
- Omar Bongo Ondimba
- Omar Hassan al-Bashir